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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b567e8755712783772ec15f6ad13834cda800743c27a62a2b46060c68bb6c613' 
  AND token = 'VibuHAX8gGwI4r2Q8cDdnrzT/7MGRBzH1X17kSjQKHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}